Stone-drilling machine



(Np Moda.)

J. T. CLARK.

STONE DRILLING MAGHINB.

N. PETERS, mau-umagnphef, wfnhinmn. mc.

Patented Feb. 6, 1883.

.fttorney l operation.

UNITED STATES.

- PATENT OFFICE.

JAMES T. CLARK, OF BATH, CALIFORNIA.

. `sToNi-zLoRiLLiNG MACHINE.

SPECIFICATION forming part of Letters Patent No. 271,792, dated February 6, 1683.

Application tiled .August 1` 1.862. (No model.)

To all whom it may concern:

Be it known that I,JAMES T. CLARK, a citizenof the UiiitedStaies, andaresident of Bat-h, in the county ot' Placer uand State .of-

Calit'ornia, have invented certain new and useful Improvements in Stone-DrillingMachines, reference being had to the accompanying drawing, Wli'ich'forins a part of this specification.

My invention has relation to devices for operatiiig mining-drills, and its object is to facilitate the handling oi' the drill andmore rapidly1 accomplish the boring 4or drilling than heretofore; and to that end the novelty coilsists in the construction of the saine, as will be hereinafter more fully set forth, and particularly pointed ont iii the claim. Y

The ligure in the drawing is a perspective view of my improved drilling mechanism in A A are the eXtensioi'i-standards, which are Vsecured to the top and bottom of the mine by the screws A1,v and the adjiistability of the standards is secured by the screws a passing through the holes a.

B is a frame provided with slots b,- b v means ot'ivhicli it is secured 'to the standards A A i by the bolts D, which permit a lateral adjustnient of the frame to the limit of the'slots.

d d are-'guides, in which the drillbar C is mounted and rotates, and Eis a collar slipped on the drill-bar` C and held iii place by the key c. The body of this collarE forms a drum, e', upon which is wound the cord f. passing over the pulley j" to the weight F, and the face of the collar is provided with ratchet-teeth t', which engage with the. stationary deteiit i on the frame B.

I is a spiral spring encompassing the drill C betweenwthe guides d, one end ofthe spring pressing against the collar` e and the other against the lower guide, d. The collar being adjusted on the drill C, so as to allow a limited play, the spring I Will force the ratchet-teeth t' into contact with the detent il', while, if the drill be pushed forward, the teeth are released and the drill makes a partial revollitiomwhich is interrupted by the rebound of'the drill, and the teeth are again forced into Contact with the detent. lt will thus be seen that as'succession of blows are given the drill the weight F, oord f, teeth t', deteiit il', and spiral spring 'I operate to allow a partial revolution ot' the drill 'after each blow.

A spring, Gr, encompasses the forward end of the i'raiiie B, and its front end is secured t the i'raii1e,while the rear end conies in contact with the standard A. This serves to force the frame and drill forward and keep thie drill np to its Work as fast as the hole is bored.

Having thus de cribed myinveiition, wha-tI claim is- The frame B, provided with slots b ,spring G, and dcteiit i", in combination with the drill C, spring I. collar e, having teeth ci, andthe cord f, and weight F, substantially as set forth.

. J. T. CLARK. Attest:

S. B. BURT, (l. A.BILKnY. 

